Zobrazeno 1 - 10
of 7 675
pro vyhledávání: '"A. Zoghbi"'
Autor:
Bogensberger, David, Miller, Jon M., Mushotzky, Richard, Brandt, W. N., Kammoun, Elias, Zoghbi, Abderahmen, Behar, Ehud
The structure of the jet in Cen A is likely better revealed in X-rays than in the radio band, which is usually used to investigate jet proper motions. In this paper, we analyze Chandra ACIS observations of Cen A from 2000 to 2022 and develop an algor
Externí odkaz:
http://arxiv.org/abs/2408.14078
Autor:
Xiang, Xin, Miller, Jon M., Zoghbi, Abderahmen, Reynolds, Mark T., Bogensberger, David, Dai, Lixin, Draghis, Paul A., Drake, Jeremy J., Godet, Olivier, Irwin, Jimmy A., Miller, Michael C., Mockler, Brenna E., Saxton, Richard, Webb, Natalie
Tidal disruption events (TDEs) can potentially probe low-mass black holes in host galaxies that might not adhere to bulge or stellar-dispersion relationships. At least initially, TDEs can also reveal super-Eddington accretion. X-ray spectroscopy can
Externí odkaz:
http://arxiv.org/abs/2407.04684
Autor:
A. Zoghbi, J. M. Miller
Publikováno v:
The Astrophysical Journal, Vol 957, Iss 2, p 69 (2023)
The soft excess is a significant emission component in the soft (
Externí odkaz:
https://doaj.org/article/68dff2c344874917b85883b22a1f64ec
Autor:
Gediman, B., Miller, J. M., Zoghbi, A., Draghis, P., Arzoumanian, Z., Brandt, W. N ., Gendreau, K.
We report on a study of the narrow Fe K$\alpha$ line and reflection spectrum in the well-known Seyfert-2 AGN, NGC 4388. X-ray spectra summed from two extensive NICER monitoring campaigns, separated by years, show strong evidence of variation in the d
Externí odkaz:
http://arxiv.org/abs/2403.00926
Publikováno v:
New Microbes and New Infections, Vol 37, Iss , Pp 100750- (2020)
The coronavirus disease 2019 (COVID-19) pandemic is redefining the world we live in, and scientists are struggling to find the best severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) diagnostic tool. Routine testing is currently performed u
Externí odkaz:
https://doaj.org/article/b4840878529b42378f2e2fdbc215d50a
Iron K$\alpha$ (Fe K$\alpha$) emission is observed ubiquitously in AGN, and it is a powerful probe of their circumnuclear environment. Examinations of the emission line play a pivotal role in understanding the disk geometry surrounding the black hole
Externí odkaz:
http://arxiv.org/abs/2312.16354
Autor:
Bollemeijer, Niek, Uttley, Phil, Basak, Arkadip, Ingram, Adam, Eijnden, Jakob van den, Alabarta, Kevin, Altamirano, Diego, Arzoumanian, Zaven, Buisson, Douglas J. K., Fabian, Andrew C., Ferrara, Elizabeth, Gendreau, Keith, Homan, Jeroen, Kara, Erin, Markwardt, Craig, Remillard, Ronald A., Sanna, Andrea, Steiner, James F., Tombesi, Francesco, Wang, Jingyi, Wang, Yanan, Zoghbi, Abderahmen
Publikováno v:
Monthly Notices of the Royal Astronomical Society 528 (2024) 558-576
In X-ray observations of hard state black hole X-ray binaries, rapid variations in accretion disc and coronal power-law emission are correlated and show Fourier-frequency-dependent time lags. On short (~0.1 s) time-scales, these lags are thought to b
Externí odkaz:
http://arxiv.org/abs/2312.09835
Autor:
Zak, Miranda K., Miller, Jon M., Behar, Ehud, Brandt, William N., Brenneman, Laura, Draghis, Paul A., Kammoun, Elias, Koss, Michael J., Reynolds, Mark T., Zoghbi, Abderahmen
Markarian 817 is a bright and variable Seyfert-1.2 active galactic nucleus (AGN). X-ray monitoring of Mrk 817 with the Neil Gehrels Swift Observatory in 2022 revealed that the source flux had declined to a lower level than recorded at any prior point
Externí odkaz:
http://arxiv.org/abs/2312.06487
Autor:
Draghis, Paul A., Miller, Jon M., Costantini, Elisa, Gallo, Luigi C., Reynolds, Mark, Tomsick, John A., Zoghbi, Abderahmen
Publikováno v:
The Astrophysical Journal, 969:40 (20pp), 2024 July 1
We extend our recent work on black hole spin in X-ray binary systems to include an analysis of 189 archival NuSTAR observations from 24 sources. Using self-consistent data reduction pipelines, spectral models, and statistical techniques, we report an
Externí odkaz:
http://arxiv.org/abs/2311.16225
Autor:
Kammoun, E., Lohfink, A. M., Masterson, M., Wilkins, D. R., Zhao, X., Baloković, M., Boorman, P. G., Connors, R. M. T., Coppi, P., Fabian, A. C., García, J. A., Madsen, K. K., Cavero, N. Rodriguez, Sridhar, N., Stern, D., Tomsick, J., Wevers, T., Walton, D. J., Bianchi, S., Buchner, J., Civano, F., Lanzuisi, G., Mallick, L., Matt, G., Merloni, A., Nardini, E., Piotrowska, J. M., Ricci, C., Wong, K. -W., Zoghbi, A., Collaboration, the HEX-P
The hard X-ray emission in active galactic nuclei (AGN) and black hole X-ray binaries is thought to be produced by a hot cloud of electrons referred to as the corona. This emission, commonly described by a power law with a high-energy cutoff, is sugg
Externí odkaz:
http://arxiv.org/abs/2311.04679